{"cve":"CVE-2026-53869","nvd":{"published":"2026-06-17T19:18:10.743","modified":"2026-10-26T11:10:00.157","status":"Deferred","description":"Hermes Agent before 0.16.0 contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation. FastAPI HTTP middleware does not execute for WebSocket upgrade requests on /api/pty, /api/ws, /api/pub, and /api/events endpoints, enabling attackers to exploit DNS rebinding and inject malicious commands or read terminal output.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-306"],"references":["https://github.com/NousResearch/hermes-agent/commit/d9ec90585cf7616b5972e44cf8d92bb569fc3feb","https://github.com/NousResearch/hermes-agent/pull/30221","https://github.com/NousResearch/hermes-agent/pull/31685","https://github.com/NousResearch/hermes-agent/releases/tag/v2026.6.5","https://www.vulncheck.com/advisories/hermes-agent-dns-rebinding-bypass-via-websocket-endpoints"],"products":[],"source":"nvd","synced_at":"2026-10-26T11:33:08.859761529+00:00"},"epss":{"cve":"CVE-2026-53869","score":0.00592,"percentile":0.48007,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-4pqm-j46f-795x","url":"https://osv.dev/vulnerability/GHSA-4pqm-j46f-795x","summary":"Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation","modified":"2026-07-13T16:42:59.391382989Z","packages":[{"ecosystem":"PyPI","name":"hermes-agent","purl":"pkg:pypi/hermes-agent","ranges":["<0.16.0"],"fixed":["0.16.0"]}]},{"id":"PYSEC-2026-2510","url":"https://osv.dev/vulnerability/PYSEC-2026-2510","summary":"Hermes Agent contains a DNS rebinding vulnerability in WebSocket endpoints that allows remote attackers to bypass Host and Origin validation","modified":"2026-07-13T16:31:57.054858358Z","packages":[{"ecosystem":"PyPI","name":"hermes-agent","purl":"pkg:pypi/hermes-agent","ranges":["<0.16.0"],"fixed":["0.16.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}